[Bug 88012] [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88012

--- Comment #82 from Michal Feix <michal at feix.cz> ---
I'm seeing very similar symptoms on my Celeron N2940 sysstem. I'm using Arch
distro with kernel 4.2.3-1. The system freezes from time to time when playing
videos, especialy when using HW acceleration. It usually happens when playing
videos from mpv with VAAPI HW decoding enabled or flash videos in Firefox with
HW decoding enabled in flash config file. System freezes usually in 10 to 30
minutes of playback. Playing videos with no HW decoding means less freezes of
my system, but not avoiding them. It just happens less frequent and from time
to time, even when no videoplayback is running in my LXDE.

My best guess is that this behavior started somewhere between kernel version
4.0.7 and 4.1.6. Unfortunatelly, I can't be more specific, as it took me more
than two months stresstesting CPU and memory before I pinpointed this problem
as most probably connected with heavy GFX usage.

I already tried a few options with no luck, like i915.reset=0/1,
i915.enable_rc6=0/1 and i915.semaphores=0/1. I couldn't feel any difference,
except with enable_rc6=9. System was even less stable then.

Using drm.debug=1 did not produce any intereseting messages before freeze. It's
filled with "random" I915_GEM_BUSY, I9!5_GEM_EXECBUFFER2 and I915_GEM_MADVISE
messages up to freeze. Of course, I can post the log if someone feels it's
interested anyway.

I'm willing to offer more help with debuging this issue.

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